Pipe joint and method of producing it



C. S. BABB.

PIPE JOINT AND METHOD OF PRODUCING IT. APPLICATION FILED JAN-22,1921.

1,41 4,800, Patented May 2, 1922.

WITNESSES:

INVENTOR:

5 Charles SiewanBaZ;

- ATTORNEYS.

' CHARLES STEWART BABB, or CHICAGO, ILLINOIS, Assrcnon. TO mm BARBERASPHALT PAVING COMPANY, or PHILADELP, rEnnsYLvANIA', A 003.

PORATION OF WEST VIRGINIA.

PIPE JOINT AND METHOD OF iBODUGING IT.

Application filed January 22, 1921.

To all whom it may concern: 1 v

Be it known that I, CHARLES S. BABB, a citizen of the United States,residing at Chicago, county of Cook, and State of Illinois, haveinvented certain new and useful 1m rovements in Pipe Joints and Methodsof l 'roducing'flThem, of which the following is a specification,reference being had to the accompanying drawings.

My invention relatesto a pipe joint especially adapted for use in sewervpipes, the joints of which are fille'd with an asphaltic or othersimilar pipe joint cement poured in hot, and therefore fluid, but which,when it has cooled, sets to form a hard and rigid juncture. In usingsuch a pipe joint cement,

, it is necessary to calk the joint where the end of the spigot of onepipe section fits against the shoulder of the bell of the next piple'section. My invention comprises a' o ring ring which performs the doublefunction of properly centering the pipe sections and of preventing thehot liquid cement from running through the joint inside the ipe. Whenthe pipe joint cement has her ened, the calkin ring has nofurtherfunction to perform, utvbeing embedded in the structure, cannot beremoved. Heretofore, these calking rings have been made of tarred oakumor similar material. But organic material such as this ultimatelydisintegrates under the influence of acids present in sewer pipes, andwhen eaten away, the resultin space weakens the pipe construction. yinvention involves the provision of" a' permanent and indestructiblecalking ring which not only performs the centering and sealing functionsbut which is capable of amalgamating with and forming part of thecementing ring proper, and which, at the same time, is indestructibleand permanent.

In the accompanying drawings, Fig. I is a sectional view of a pipe jointhaving my calling ring in place at the shoulder of the bell, prior tothe POHIlIlii-l of the hot pipe joint cement for the ma g of thepermanent joint.

Fig. II is a sectional view showing the pip; joint as completed.

v eferring to Fig. I, it w1ll be noted that within the shoulder of thebell 2 of pipe section l, there placed a calking ring 3 Specification ofLetters Patent.

Patented May 2,1922.

Serial No. 489,283.

is of a ru bery, somewhat elastic, but very tough nature, notsusceptible to ordinary temperature changes, nor of being attacked bythe fluids of a sewer pipe. It is made of am blown or onidizedhydrocarbon, and is produced in sultablestrips which'are cut 1ntolengths and are sufficiently elastic to p erm1t them to be bent into theform of a ring. For example when asp'haltic petroleum, preferablycontaining a hlgh amount of sulphur, such as Mexican petroleum, isreduced by distillation to a reslduum of say-about 400 F. flash pointand then air blown at ab'out4 50 F. until it attains a melting point offrom 200 to 250 F., there is produced a tough, rubbery material which 1svery suitable for thepurposes ofmy invention. It is s'uflicientlyplastic topermit the spigot of the pipe section 4 to be forced into thering under pressure; the ring being of such diameter as to properlycenter the pipe sections and to produce a seal when the sections havebeen forced into place. In this position, asplit ring or runner band 5of clay .or other" appropriate material is placed around the spigot endof. section 4 f fullers earth. It is of such a character that whenheatedto about 400 F.- for use, it is suificiently fluid to be freely poured,as I have described, so as to fill the space between interfitting pipesections; but at atmospherlc temperatures, it is hard and tough, waterproof and acid proof, and strong enough to retain its shape and positionunder all the.

strains to which sewer pipe is liable to be subjected. It is unafi'ectedby ordinary extremes of temperature, and therefore it is not displacedwhen the pipe joint is sub-' jected to ressure or strains. It is acharacteristic vantage of my invention that hot all pipe joint cement,such as l have described, when poured in place as explained, fuses thesurface of the calking ring with which it comes in contact, andsuperficially amalgamates with it without, however, melting the whole ofsaid calking ring. This latter contingency would be objectionable,permitting the escape of the hot pipe joint cement into the inside ofthe pipe, but the superficial fusing oi the ring and its amalgamationwith the rest of thejoint produces a. homogeneous structure which whenthe band 5 is removed, assumes the appearance shown at 6 in Fig. H.

I am aware that. it has heretofore been: proposed to seal pipe joints bythe use of prepared bituminous packing rings-softened suficiently by asolvent to permit the spigot end of the pipe to be forced into placewithin it,- but such rings have occupied the entire joint space andhave. been found-to not possess s cient strength and rigidity topermanently hold the pipe sections in place under the strains. of use.It is characteristic of, my invention that, although the calhing ringpossesses suficient elasticity to permit the forcingtogether of adjacentsections of pipe, and to hold: them in place during the sealing of thejoint, the ultimate formation of the joint by the cold pipe cement; ishard, strong and rigid without being brittleor pli able, and not liable.under pressure to be forced out of place.

Having thus described my invention, ll claim: I

1. A, pipe joint havinga calhing ring formed of air blown petroleumresiduum having a suficiently rubbery consistency withoutheatmg orsolution to permit the spigot of one pipe section to be forced intoplace within it, and to center this-and the adjoining pipe section andat the sa time to seal. the joint preparatory to the pouring of hot pipejoint cement betweenthe sections.

2. A pipe joint within the bell of one pipe section and surrounding thespigot of the adjoining section comprising two parallel rings of diderinmaterials, the ring nearest the shoulder of t e bell consisting of ablown hydrocarbon of a tough and rubbery nature, andthe other ring beingcomposed of a hard bituminous cement capable of being poured when hot,but which, at ordinary temperatures is strong and rigid.

3. A pipe joint comprising a tough and rubbery ring of blownhydrocarbon, and an adjacent hard and rigid ring of asphalt cementamalgamated together by pouring the asphalt cement ring into place whenhot whereby the adjoining surface of the other ring is fused withresulting complete amalgamation of the two rings.

a. The method of forming a pipe joint, which consists in placing withinthe shoulder of the bell oi a pipe section a calking ring of blownhydrocarbon having rubbery and plastic consistency, forcing a spigot ofanother pipe section within said calking ring whereby the two pipesections are centered .and the joint between them sealed, pouring intothe remaining space between the spigot and bell a melted bituminouscement with resulting fusion of the surface of the call:- ing ring andamalgamation of the two materials, and permitting the two to cool andsolidify, whereby the resulting pipe joint-is strong, and rigid andwholly indestructible by disintegrating influences. In testimonywhereof, l[ have hereunto signed my name at Chicago, Illinois, this 13thday of January, 1921.

CHARLES STEWART BABE. Witnesses:

J. J. Knnnnrcn, (CARL 18. HA.

